Hi Pallam,
According to your description, you want to disable vertical scroll of ScrollViewer in GridView control. There is an easy work around, edit the control template and disable the ScollViewer vertical scroll. Right click on your GridView control in XAML Designer,
find the ScollViewer control in GridView control template, and set the
VerticalScrollMode property.

If I have any misunderstanding, please feel free to let me know.
Regards,
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